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【单选题】

岛礁区航行,通过珊瑚礁的最有利时机是微风、_____________和___________时。

A.
高潮、面向太阳
B.
高潮、背向太阳
C.
低潮、面向太阳
D.
低潮、背向太阳
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【单选题】Text 2 We recently sailed with our research ship through the Red Sea to the Indian Ocean where we did research work for about a year. Our main objectives (目标) were the little-known Maldi...

A.
the coral reef exists in regions with warm climate
B.
the coral reef provides favorable living conditions for them
C.
the creatures are away from the danger of being eaten by sharks
D.
most sea creatures feed on the colourful coral

【多选题】一艘航行于内河的45m客船,关于驾驶室安装的电动舵角指示器,下列叙述正确的有哪些()

A.
舵角指示装置应由独立分路供电
B.
舵角指示装置与实际舵角的误差精度应不大于1.5度
C.
舵角指示装置与实际舵角的误差精度应不大于1度
D.
驾驶室的舵角指示装置应有亮度可调的照明灯或夜光刻度